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Strong- and weak-coupling mechanisms for pseudogap in electron-doped cuprates
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Strong- and weak-coupling mechanisms for pseudogap in
electron-doped cuprates
V. Hankevych, a,b B. Kyung, a A.-M. Dare?, c D. Se?ne?chal, a and A.-M. S. Tremblay a
aDe?partement de physique and Regroupement que?be?cois sur les mate?riaux de pointe,
Universite? de Sherbrooke, Sherbrooke, Que?bec J1K 2R1, Canada
bDepartment of Physics, Ternopil State Technical University, 56 Rus’ka St., UA-46001 Ternopil, Ukraine
cL2MP, 49 rue Joliot Curie BP 146, Universite? de Provence, 13384 Marseille, Cedex 13, France
Abstract
Using the two-particle self-consistent approach and cluster perturbation theory for the two-dimensional t-t′-t′′-U
Hubbard model, we discuss weak- and strong-coupling mechanisms for the pseudogap observed in recent angle
resolved photoemission spectroscopy on electron-doped cuprates. In the case of the strong-coupling mechanism,
which is more relevant near half-filling, the pseudogap can be mainly driven by short range correlations near the
Mott insulator. In the vicinity of optimal doping, where weak-coupling physics is more relevant, large antiferro-
magnetic correlation lengths, seen in neutron measurements, are the origin of the pseudogap. The t ? J model is
not applicable in the latter case.
Key words: Pseudogap, the Hubbard model, electron-doped cuprates, antiferromagnetic fluctuations
PACS: 74.72.-h, 71.10.Fd, 71.27.+a
Angle resolved photoemission spectroscopy [1]
(ARPES) provides deep insight into the nature
of high-temperature superconductors. In partic-
ular, it has revealed the failure of Fermi liquid
theory to describe single-particle excitations in
these systems. Contrary to the quasiparticle con-
cept of Fermi liquid theory, certain segments of
the would-be Fermi surface are almost gapped.
This is the so-called pseudogap phenomenon. In
particular, recent ARPES measurements [2] on
Nd2?xCexCuO4 have shown that, in contrast to
the hole-doped cu
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